void main() {
    //整数相除
    int a = 7 / 2;
    System.out.println(a);

    //取余运算
    int b = 10 % 3;
    System.out.println(b);

    //除法与小数
    double c = 5 / 2;
    System.out.println(c);

    //填缺失的数字
    int x = 12 / 3;
    System.out.println(x);   //期望输出 4

    //填缺失的数字
    int y = 17 % 5;
    System.out.println(y);   //期望输出 2
}